[llvm] spurious multiple definition errors when linking with gcc

[filnet]

I am one of the maintainers of the MSYS2 build of Rust.

Since upgrading to LLVM 16.0 the GCC build of Rust fails with the following error.

error: linking with `gcc` failed: exit code: 1
  |
  = note: "gcc" "-Wl,C:\\msys64\\tmp\\rustciRqrEC\\list.def" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib\\rsbegin.o" "C:\\msys64\\tmp\\rustciRqrEC\\symbols.o" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\rustc_driver-3739812f65223964.rustc_driver.f3d3923a-cgu.0.rcgu.o" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\rustc_driver-3739812f65223964.45i5ipghey6bp2hn.rcgu.rmeta" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\release\\deps" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\build\\stacker-9b4be49ef4829d62\\out" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\build\\psm-a84fb5db19ebcf4a\\out" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\build\\rustc_llvm-317c9010c8d9d071\\out" "-L" "C:/msys64/mingw64/lib" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib" "-Wl,-Bstatic" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_driver_impl-28d79fbe3ff52d33.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_log-8badda9c9727e4f8.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_error_codes-77f1b77cb71034ed.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_interface-793a720584637140.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_codegen_llvm-aee538f94724ec4d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_llvm-e5bef6461610b7d4.rlib" "-lffi" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_ty_utils-2cba2545615869cc.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_hir_typeck-57c1f757e4a3bf2d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_privacy-1bc18dfe2dd93b97.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_hir_analysis-9ce23f7854d6d04b.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_monomorphize-dcca96494f9b7634.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_mir_transform-0ae3f2be33f7d9dc.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_ast_lowering-1d9e59e11a3b0aea.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_builtin_macros-f5ff9e981c7c9b6b.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_resolve-9ce40720df5ba3ae.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libpulldown_cmark-c44bbe8a2e78eaf1.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libunicase-b5ce8e44ecadeb6d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_passes-15b835720a4442b5.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_mir_build-8f96b493f7911a7f.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_borrowck-55aa98729451235c.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_traits-5bbeed01fd278c5e.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libchalk_engine-cf421ee873b31b83.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libchalk_solve-da00c93138eb69f9.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtracing_tree-dc1898b09441f9ba.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libatty-72c4886a855ffba5.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtracing_subscriber-33b496dde70e3fa1.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libthread_local-5a62f639c19225dd.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libsharded_slab-b913061ae5f90140.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libansi_term-c83403532c5f93c9.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libmatchers-c664264b5b981f48.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libregex_automata-16e4647b55e2e197.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtracing_log-fb2bfaf498c67a38.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\liblazy_static-3ecc5d8014e2168f.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libpetgraph-6640b6424485b7bb.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libfixedbitset-14dd6219bd85df5e.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_const_eval-da17bbb7d9847651.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_mir_dataflow-b3186c6fc1a07ad8.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_query_impl-bf11f12c93ef9f6d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_codegen_ssa-79127d665db6e8bd.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libthorin-b8207f5f9699c058.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libgimli-090f758ce0ac437c.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libfallible_iterator-e2cb92ca2d524f8e.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_symbol_mangling-c739a4bcc712e929.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_demangle-d7b0d86bb29d42ad.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libpunycode-10d0138521972523.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtwox_hash-070b0ec4204e28f7.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libstatic_assertions-f483bc43b61e0e37.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_incremental-27f5dde200a9cbf6.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libpathdiff-6d09260943975ede.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libregex-4e031f8082cc5c18.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libaho_corasick-8a3c73bd0761de47.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libregex_syntax-b46d230ebd9ccb78.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libcc-e8deb52039ec09b9.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libobject-d56fa5a019e31b87.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libflate2-40631ba368e44bd4.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libminiz_oxide-57e6ca4aa61198d8.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libadler-4763266e9e407be5.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libcrc32fast-602d2491b2088e9a.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libar_archive_writer-4b21cb093134633f.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libobject-f731d1e99ac947e3.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_plugin_impl-eb3e07b9661ac4a2.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_metadata-a623859e0e9f9091.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_hir_pretty-4688f19118e72fde.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libsnap-6bb5b13e67909cab.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_expand-0ab8b80cf7ebb98d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libcrossbeam_channel-673d64dd45ec9093.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libcrossbeam_utils-c5fe0f629c592757.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_ast_passes-9ef612c3977af879.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_parse-df7b83332f1c6a6d.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib\\libproc_macro-719ef05d02ed46e8.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\liblibloading-a51d0a5cc60361a9.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_lint-2b2fe58019370d13.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libunicode_security-91794485c82c0d96.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libunicode_script-a8087a7791836675.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libunicode_normalization-405364c8cd61fee0.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtinyvec-bbb40bef8ba9f9dc.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtinyvec_macros-4c46aa791590b9dd.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_trait_selection-e361e5f7ca8c7764.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_transmute-78b9189a11c99b82.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_parse_format-aa53e31edafca8e9.rlib" 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"C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_graphviz-93e13a648629d365.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libjobserver-896462d587f8a54a.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_hash-8effb2948dd352f1.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_index-10c8ce0c31b24f67.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_serialize-9bf786a9f6286112.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libindexmap-24b54088a92758a0.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libhashbrown-ab02391bffeb9f7a.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libahash-fe159b02ce708ee2.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libgetrandom-945a69d01a3ff9be.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libthin_vec-8e89c0587ca127cc.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libsmallvec-04cc756b00538235.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libarrayvec-17585cc170081b80.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtracing-4157a7c81df00b36.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libcfg_if-906851f37a9ef65e.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libpin_project_lite-4cf3d85b4aa8c603.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libtracing_core-9b389ededd562ca0.rlib" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\libonce_cell-e6930bc4b20f32a0.rlib" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib" "-Wl,-Bdynamic" "-lstd-01b33b2c8e8556fd" "-Wl,-Bstatic" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib\\libcompiler_builtins-ee580a67a467286a.rlib" "-Wl,-Bdynamic" "-lpsapi" "-lshell32" "-lole32" "-luuid" "-ladvapi32" "-lpthread" "-lz" "-lzstd" "-lxml2" "-lstdc++" "-ladvapi32" "-lole32" "-loleaut32" "-ladvapi32" "-lcfgmgr32" "-lgdi32" "-lkernel32" "-lmsimg32" "-lopengl32" "-lpsapi" "-lsynchronization" "-luser32" "-lwinspool" "-lbcrypt" "-lkernel32" "-ladvapi32" "-luserenv" "-lkernel32" "-lws2_32" "-lbcrypt" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib" "-o" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\rustc_driver-3739812f65223964.dll" "-shared" "-Wl,--out-implib=C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-rustc\\x86_64-pc-windows-gnu\\release\\deps\\librustc_driver-3739812f65223964.dll.a" "-Wl,-O1" "-nodefaultlibs" "C:\\M\\mingw-w64-rust\\src\\MINGW64\\build\\x86_64-pc-windows-gnu\\stage0-sysroot\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib\\rsend.o"
  = note: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassBuilder.cpp.obj):(.bss$_ZN4llvm3Any6TypeIdIPKNS_8FunctionEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_8FunctionEE2IdE]+0x0): multiple definition of `llvm::Any::TypeId<llvm::Function const*>::Id'; C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassWrapper.o):PassWrapper.cp:(.data$_ZN4llvm3Any6TypeIdIPKNS_8FunctionEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_8FunctionEE2IdE]+0x0): first defined here
          C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassBuilder.cpp.obj):(.bss$_ZN4llvm3Any6TypeIdIPKNS_6ModuleEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_6ModuleEE2IdE]+0x0): multiple definition of `llvm::Any::TypeId<llvm::Module const*>::Id'; C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassWrapper.o):PassWrapper.cp:(.data$_ZN4llvm3Any6TypeIdIPKNS_6ModuleEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_6ModuleEE2IdE]+0x0): first defined here
          C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassBuilder.cpp.obj):(.bss$_ZN4llvm3Any6TypeIdIPKNS_13LazyCallGraph3SCCEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_13LazyCallGraph3SCCEE2IdE]+0x0): multiple definition of `llvm::Any::TypeId<llvm::LazyCallGraph::SCC const*>::Id'; C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassWrapper.o):PassWrapper.cp:(.data$_ZN4llvm3Any6TypeIdIPKNS_13LazyCallGraph3SCCEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_13LazyCallGraph3SCCEE2IdE]+0x0): first defined here
          C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassBuilder.cpp.obj):(.bss$_ZN4llvm3Any6TypeIdIPKNS_4LoopEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_4LoopEE2IdE]+0x0): multiple definition of `llvm::Any::TypeId<llvm::Loop const*>::Id'; C:\M\mingw-w64-rust\src\MINGW64\build\x86_64-pc-windows-gnu\stage0-rustc\x86_64-pc-windows-gnu\release\deps\librustc_llvm-e5bef6461610b7d4.rlib(PassWrapper.o):PassWrapper.cp:(.data$_ZN4llvm3Any6TypeIdIPKNS_4LoopEE2IdE[_ZN4llvm3Any6TypeIdIPKNS_4LoopEE2IdE]+0x0): first defined here
          collect2.exe: error: ld returned 1 exit status

Shorter version : multiple definition of `llvm::Any::TypeId<llvm::Function const*>::Id';
They are defined in PassBuilder.cpp.obj and PassWrapper.o.

I have traced the cause of the error to this change: 95b27b2
Rerverting it fixes the build issue.

In a nutshell, Rust builds it own C++ wrappers around some LLVM classes.
It happens that both Rust and LLVM end up instantiating the same "static template".
Apparently having these instances "constant" allows GCC to merge them (?).
If they are not constant, GCC fails with multiple definition errors.

Note that the Clang build is fine.

[shafik]

CC @Flakebi @JoeLoser

[Flakebi]

The commit explicitly makes the Id non-constant so they cannot be merged, because merging the Id between different template instantiations breaks llvm::Any :)

It happens that both Rust and LLVM end up instantiating the same "static template".

I don’t quite understand how that happens, LLVM uses any_cast with the same types in multiple files and it links fine. So why is this a problem when compiling Rust with gcc on mingw and not somewhere else?

One interesting thing in the error message:
PassBuilder.cpp.obj defines llvm::Any::TypeId<llvm::Module const*>::Id in .bss
but PassWrapper.o defines it in .data.
Maybe that is the reason why they cannot be merged?

Edit:
Maybe initializing the type id with a non-zero value forces putting it into .data

template <typename T> char Any::TypeId<T>::Id = 1;

[filnet]

A simple workaround would be to make the templates non constant only for MSVC ?

What about the other template:

  // The `Typeid<T>::Id` static data member below is a globally unique
  // identifier for the type `T`. It is explicitly marked with default
  // visibility so that when `-fvisibility=hidden` is used, the loader still
  // merges duplicate definitions across DSO boundaries.
  // We also cannot mark it as `const`, otherwise msvc merges all definitions
  // when lto is enabled, making any comparison return true.
  template <typename T> struct TypeId { static char Id; };

Isn't it highly dangerous that the static char is not const anymore ?
Does it allow malicious code to change the Id at runtime ?

PS: I haven't used C++ in years.

[Flakebi]

Does it allow malicious code to change the Id at runtime ?

The value of Id does not matter, it’s never used. The only thing that matters is that the address of Id is different for every template type T. Because the address of Id is compared to check if the object contained in an llvm::Any is of a certain type.

A simple workaround would be to make the templates non constant only for MSVC ?

I would prefer something that can be the same code for all compilers.

Can you try if initializing the Id to something non-zero fixes your rust build?

template <typename T> char Any::TypeId<T>::Id = 1;

This should force the value to always land in the .data section.

I don’t understand how they end up in different sections, the flag -fzero-initialized-in-bss/-fno-zero-initialized-in-bss controls gcc’s behavior, but I don’t see it used in llvm or rust. Using different compilers for llvm and rust could maybe cause that behavior.

[filnet]

Can you try if initializing the Id to something non-zero fixes your rust build?

Will try that.

Using different compilers for llvm and rust could maybe cause that behavior.

llvm and rust are both compiled with gcc in our case.

[mati865]

llvm and rust are both compiled with gcc in our case.

Actually LLVM is built with Clang (and linked with ld.bfd) since msys2/MINGW-packages#12866 because GCC cannot build LLVM library with all targets because of the symbols limit.

[filnet]

Changing to template <typename T> char Any::TypeId<T>::Id = 1; works.

[Flakebi]

Thank you for testing it!

I put a patch with this change into https://reviews.llvm.org/D148953.

[filnet]

Thanks for the fix!